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Posts for: Lille
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May 21, 2018 13:24:46   #
CHG_CANON wrote:
The newest version (Nikon 70-300mm f/4.5-5.6E VR AF-P FX) is listed as compatible with the D7100, although she may need to download and install a firmware update to the camera. Alternatively, consider the "G" version from Nikon. Check pricing on EX or EX+ rated used models at KEH.com


Thank you :)

Incidentally she has the 55-300mm Nikon but she's been told that the 70-300 is a much better lens. I hope that's true before she spends the money on another 300mm zoom.
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May 21, 2018 13:17:12   #
My college age daughter has a Nikon D7100. She'd like to buy an inexpensive ( < 1K ) used lens lens to shoot some college soccer games. I know there are many models of the Nikon 70-300mm lens made and she thinks that's what she'd like to have, but I have no clue which one would be best for her to look for.

Any suggestions ?

Thanks.
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Apr 27, 2018 11:27:44   #
TomV wrote:
I think my offer of you being a bit too close in front of the hyperfocal distance holds true. You have to think about the tolerances of the lens and the sort-of imprecise theory of the hyperfocal concept. Just a few feet in front of the HF distance will cause the DOF to change dramatically. If the HF is distance is 12.4 ft at 30mm the DOF at far end is at infinity. If the lens is actually at 31mm due to manufacturing tolerance then the HF distance is 13.24 ft and the far end in 'acceptable focus' is 194 ft at the expected HF distance of 12.4 ft. If the aperture is larger by a fraction the same effect takes place (from 8.0 to 7.1), the DOF is reduced substantially to 113.5 feet at the expected HF distance of 12.4 ft.

You need to select a focus point a bit further beyond the theoretical HF value to ensure you are not at the edge. In this case you should select something about 16 ft or greater, allowing for a f/7.1 and a focal length of 32mm (about a 7% tolerance). Per the equation, this will allow for tolerance issues and still get the DOF out to infinity with a near 'acceptable focus' distance of about 8 ft.
I think my offer of you being a bit too close in f... (show quote)


Thank you Tom.
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Apr 27, 2018 11:27:14   #
Dennis833 wrote:
Also when you focus the lens make sure that you use the focus magnification at X14.4. Set the aperture to F4 to focus then stop down to F8-11 to shoot.


Thanks for the advice Dennis.
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Apr 25, 2018 19:02:53   #
Dennis833 wrote:
It looks like the image was shot at F4, wide open and the focus is only about a metre away on the fence in front. Put the 16-35mm F4 lens on the camera and look at the front of the lens as you close the aperture down. The aperture should be a lot smaller F22 than at F4. If the aperture does not move then the lens is stuck at F4. If the aperture is working properly do three more test shots focusing manually with your aperture set at F4 to focus and then close the aperture down to F11 to take the test shots. Using a tripod and the two second delay focus shot 1 on the fence post, shot 2 on the power pole and shot three on the background trees.
It looks like the image was shot at F4, wide open ... (show quote)


Hi Dennis,

Thanks for your input.

I'll try what you've suggested but I can say without question that the aperture is not stuck on either lens ( the blades open and close as they should ) and for that photo I had the aperture set to f8 and the meta data from Lightroom says the photos was shot at f8.

But I'll still do as you've suggested.

Thanks !
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Apr 25, 2018 18:54:53   #
TomV wrote:
You are all making this too difficult. If you put numbers into the DOF calculator you will find that a difference of only a foot or 2 short of the hyperfocal value results in a large difference in the DOF distance from front to back.
Example, using DOF Master: 29mm, f/8, the calculated Hyperfocal distance is 17.3 ft. The DOF extends from 8.65 ft to infinity. I used a 1.5 crop sensor camera for these values.

However, if you focus at a subject at 15 ft your DOF for Acceptable Sharpness ranges from 8.05 ft to 110.5 ft.
And, if you focus at a subject at 16 ft your DOF for Acceptable Sharpness ranges from 8.3 ft to 206 ft
And, if you focus at a subject at 17 ft your DOF for Acceptable Sharpness ranges from 8.6 ft to 862 ft.
And, if you focus at a subject at 17.32 ft your DOF for Acceptable Sharpness ranges from 8.67 ft to Infinity. Anything beyond 17.31 ft gets an Acceptably Sharp distant background for these parameters.
And, if you focus at a subject at 30 ft your DOF for Acceptable Sharpness ranges from 11 ft to Infinity

As you can see, if you are just a hair too close relative to the hyperfocal distance you lose a tremendous amount of the DOF.


It clearly is best to err on the far side and get your background but feel comfortable that you will get most of the near stuff you want also.
You are all making this too difficult. If you put ... (show quote)



Hello Tom,

Thanks for taking the time to respond.

There is quite a difference between the hyper focal distance for a for a 1.5 crop sensor and a full frame camera. For my Sony a7rii ( full frame ) camera the hyper focal distance with a 29 mm lens shot at f8 is just under 13 feet and the camera was shot at f8 and focused on something that was beyond 13 feet.

Thanks :)
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Apr 23, 2018 16:35:08   #
Linary wrote:
So to recap, you did use f/8, you did use a tripod, you did set a timer delay.
Your shutter speed was 1/50th sec. and whilst this should not really cause focus issues (you were using a tripod), see if you can shoot something at 1/500 sec. or faster.
Many of the comments above are very pertinent, - shoot a series from f/4 to f/16; shooting a high contrast target of some kind; If you can beg or borrow another lens to try it might confirm that your lenses are good or bad.

In answer to your question re the wind etc. Everything would be affected by gusts hitting the camera but some parts of the image more than others. If the camera moved around a pivot, then the outside pixels would travel further than the centre pixels. The outers would appear out of focus, the inners would appear to be soft.

A couple of days ago I lost sixty or so images because I had not fully tightened the locking knob on my tripod and did not notice the slow droop of the camera. Thus ended that session of time lapse. Make sure everything is locked down tightly. Tripod on solid ground, not gravel etc.

A friend of mine who has the same Sony as you - I don't know what lenses he has - told me it took a while before he got used to the camera coming from a Canon background. Several months down the line, he is now producing pin sharp images. (n.b. English pins are sharper than USA tacks )
So to recap, you did use f/8, you did use a tripod... (show quote)


Thank you !

All of what you've suggested is on the itinerary ! I'll let you know how it works out.

Thanks again.

In fact.... Thank you to everyone who has responded .
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Apr 23, 2018 16:31:32   #
ballsafire wrote:
I would make an appointment with an eye doctor - you might need special eye help to focus. Anyway, I don't see enough to call your photos out of focus.

Hi,

But if I were totally blind and the lens & camera auto focus worked properly I could still be taking sharp photos.even if I couldn't look at them.... no ?
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Apr 23, 2018 14:18:53   #
dsmeltz wrote:
I thought you said it was on a tripod. Is now handheld?

And, Yeah to the filter. I had not thought of that, but a cheap filter could certainly cause that.


No filter and a tripod

:)
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Apr 23, 2018 14:18:12   #
amfoto1 wrote:
To me, the entire sample image appears "soft" (I don't care what Photoshop "says").

I haven't seen anyone ask what might be the simplest question and easiest solution all...

Do you have a "protection" filter on the lens? If so, have you tried shooting without it?

Filter quality can effect every image made with it. But also some lenses just don't "play well" with filters... even very good filters. I am not familiar with your particular lenses, but... for example, the original Canon EF 100-400mm (push/pull zoom version) doesn't "like" filters. Anything on it... even the best filters made... cause it to go soft. And when that happens it's much like you are seeing... the entire image is soft.... not just one part of it (which is what's usually seen when focus is off or a lens has a de-centered element or other fault). A lot of 100-400mm lenses were stunned to learn how sharp their lens was, when they removed the "protection" filter they'd had on it from new (after all the, lens' deep hood probably does a better job of "protecting" than some thin piece of glass ever could).
To me, the entire sample image appears "soft&... (show quote)


No protection here ! At least not on my lenses.

The only filters I've ever used are pretty high quality polarizing filters and occasionally an ND filter. The ND not so often as I still have lots to learn about them. I'm quite sure I didn't have a polarizing filter on the photo I posted.

Thanks :)
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Apr 23, 2018 13:50:16   #
rts2568 wrote:
Hi Lille,

My suggestion may not be the complete answer but I suggest that a lot of your problem maybe yours alone. Let me explain. Your aperture selection is fine, your speed however is not, not even on a tripod often.
What I suspect is that you are getting camera shake when you press the shutter button. If you must use that shutter speed, then use a long cable release instead of pressing the shutter. Or use a wireless remote control, they are very cheap these days.
Raising the ISO might help you increase the speed as well.

All the best for future shooting,

Ron
Hi Lille, br br My suggestion may not be the comp... (show quote)


Hi Ron,

You may be right about the shutter seed though I've always thought that as a 'general rule' when shooting a hand held shot with a DSLR one should normally not use a shutter speed that is lower than the focal length of the lens. I.E. don't use less than 1/100 of a second when using a 100mm lens or not less that 1/50 of a second with a 50mm lens. So I would assume that using a camera that does not have a mirror to slap around, mounted on a very sturdy tripod using a 2 second shutter delay and with no wind using a shutter speed that is almost TWICE the fl of the lens would be high enough. But maybe not.

Also if 1/50 is to slow and causing a blurry photo would not the entire photo be fuzzy ? ( parts of this photo is not blurred at all )

I need to go out and shoot more !!

Thank you Ron
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Apr 23, 2018 12:23:05   #
dsmeltz wrote:
A micro-adjustment is an adjustment made for that lens in the camera to correct for front or back focusing. A focus magnifier is not a micro-adjustment.


Ah ! I'll look into that as I have not done any micro adjusting of either lens.

Thank you .
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Apr 23, 2018 12:19:26   #
gessman wrote:
I did neglect to mention that I definitely agree with your premise that you should generally have better overall focus in the picture given your stated intent and methodology with your selection of a hyper-focal point. I can't argue with your position on that. Good luck with getting it all figured out as I'm sure you will.


Thank you Gessman !

I'm beginning to feel a bit guilty as I suspect that I might have been a bit hasty even posting about this. I strongly suspect that I have a lens problem and I thought that before I even posted. I probably should have spent more time looking into this on my own before I bothered you and other UHH members about it.

Thank you ( and everyone else ) again
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Apr 23, 2018 12:12:37   #
dsmeltz wrote:
Do you have a sample where you focused manually? Have you ever entered a micro-adjustment for either of these lenses in your 850?


Hello,

When I focus manually I always use the camera's "focus magnifier " or micro adjustment. The Sony has two, a 5x and a 12.5 X which I use most often.

I have hundreds of manually focused shots and they all look just about the same as the AF shot I posted. Just a bit soft :)

Thank you
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Apr 23, 2018 11:53:45   #
repleo wrote:
Do you use focus peaking? Does the focus peaking correspond with the depth of field you expect from your hyperfocal calculations? Try something with a tighter DoF to check.
Do you have the latest firmware? One of the earlier updates dealt with some focusing issues.
Check your Image Size and Quality settings.
Try a Setting Reset?

There is definitely something wrong with the results you are getting. Your two lenses have a sharpness rating of 26 and 24 on a A7Rii per DXO. Not stellar but very good for a zoom lens.
Do you use focus peaking? Does the focus peaking ... (show quote)


Hello repleo,

I do use focus peaking but of course that only applies to manual focusing while the photo I posted was auto focused. So no peaking available.
Camera has the latest greatest firmware and has been reset twice.
Size and quality...I shoot in raw.

Thanks :)
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